So Tesla uses Chineseum too? American steel fails just like Chinese to Hutchison Effect which is why Teslas experience spontaneous fracture in its suspension. If you recall I was bullish Cybertruck because of its EM shielding exoskeleton. However having learned more about Hutchison Effect and Teslas whompy wheel issues, have left me no longer bullish on Cybertruck.
I do not know the rate of decay for earths magnetic field. However the more it decays the more these sorts of problems will increase. I advocate reducing dependency on technology and increased usage of ceramics for just this reason. Those "500 year" ceramic buildings ive mentioned will not suffer decay like metal dependent structures will.